*** “The scientists thought Sister Maria had perhaps created the code using a blend of existing alphabets. And thanks to her years of exposure to religious scripture, the nun had been a skilled linguist with knowledge of both ancient and modern languages. So it was that the experts’ theory proved to be right.”
A lot of it was just incoherent babbling. But some of the sentences formed specific thoughts. Evidently, IF she had written or spoken those words in plain language, she would have been accused of heresy and quite possibly burned at the stake. Now that they know what the letter said, using an understanding of modern psychiatric medicine, mental health professionals have written Sister Maria off as a schizophrenic. It wasn't The Devil's handwriting, it was her own.
REFERENCE: “In 1676 A Possessed Nun Wrote A Message From The Devil. Now The Spooky Letter Has Been Translated | Scientific Mirror” By Richard Arghiris, Nov 16 2021 ~ https://web.archive.org/web/20220219182310/https://scientificmirror.com/s/1676-possessed-nun-message-devil-letter-translated?as=799&bdk=0